Classic - 10.0 Pre + 8.0B Power Amplifier ( Used )

by **ASTLEY** Thu Jun 15, 2017 8:02 pm

No.10.0 is a type of transistor pre-amplifier with function of headphone amplification and remote control. Its main amplifying circuit derives from the patent circuit of Beijing Yushang Electroacoustic Technology co., Ltd. The build is ultra thin structure (45mm in height).

SEPP (pull-push) voltage regulator firstly adopted in China was developed and produced by Yushang Co itself. This voltage regulator features low internal impedance, less ripple and fast response rate , etc so that it can keep invariable ripple from zero load to full load (<8μV RMS), just like the characteristic of feeding storage battery. Every parameter and sensation of listening all are better than those series or shunt regulators that are commonly used. The regulator’s sampling amplification adopts single operational amplifier in high conversion rate and sampling amplification of 100% for AC/DC. High accuracy components are used for reference voltage.

Unlike those operational amplifiers being commonly used without negative feedback, every part of the earphone amplification consists of discrete components, so it completely eliminates the impact to negative feedback loop, which is caused by the inductance and distributed capacitance at earphone lead and the portion of coil. It can drive moving-coil earphone of 30ohm-300ohm.

No.10.0 uses R-shaped power transformer, double-sided PCB, gold-plated RCA jackets, FOR AUDIO and WIMA capacitors, ALPS motor potentiometer and other Hi-End components, etc. It is equipped with an output time-lag protection at line output port.

Remote function: stand-by, input selection, etc.

Sound representation: full and mellow, broad sound field and localization of precision and clarity. It is excellent in combining with improved version of No.8.0, No.8.0B that belongs to Beijing Yushang Co. Moreover it is in reasonable and modest price.

Though No.10.0 is only a style of pre-amplifier in low price, its value on technology content is far greater than its selling value.
Specifications

Total Harmonic Distortion(THD+N):
0.006%(1KHz 2V RMS)Pre-amplifier
0.006%(10KHz 2V RMS)Pre-amplifier
0.05%(1KHz 300ohm 15mW)Earphone amplifier
Frequency Response:
5Hz-100KHz(-3dB 2V RMS)Pre-amplifier
5Hz-100KHz(-3dB 300ohm 15mW)Earphone amplifier
Gain:20dB
Earphone Impedance:30ohm-300ohm
Input Impedance:80Kohm
S/N:
90dB(without weight)Pre-amplifier
98dB(without weight)Earphone amplifier
Input Interfaces:RCA 4groups
Output Interfaces:RCA 2groups
Earphone Output Jack:f6.35mm big three conductor jack
Remote:RC-602
Power Voltage:Customized according to different mains in different countries and regions
Static Power Consumption:6W
Dimension:430(W)×293(D)×45(H)
Packing Size:480(L) ×370(w)×155(H)
Net Weight:2.8Kg
Gross Weight:4.8Kg
No.8.0b is an update version of No.8.0 whose appearance is same as No.8.0.
The improved items include circuit structure, parameter, chosen components, arrangement for circuit board, inside construction and electromagnetic radiation, etc. All of these make it more rationalized and reach an anticipative design purpose.
No.8.0b uses the PCB with copper foil of 2ounce. It adopts large-area ground screen and widens fused stannum at the place where large current go through. It employs Japanese Toshiba high power transistors, Rubycon MUSE electrolytic capacitors, German WIMA MKS capacitors and customized polystyrene capacitors and metal film resistors from appointed factory. The resistors that are relevant to closed loop use metal resistors with error amount of 1%. High power resistors are Japanese KOA foil non-inductive ones. R-shaped 260Wtransformer is specially designed. There are double power supply system, electronic filtering in voltage amplifier and full-function IC protection circuit. Its front panel made of sheet aluminum is 10mm in thickness. The chosen transistors’ brand names and models were compared over and over again before they ware adopted.
No.8.0B’ sound representation: full and mellow at low frequency, rich timbre texture at mid -frequency and high frequency and charming musical richness. So it can match more kind of loudspeakers.
Specifications:
- Rated Output Power:150W(8ohm RMS) 240W(4ohm RMS)
- Total Harmonic Distortion(THD+N):0.005%(1KHz 120W RMS 8ohm) 0.005%(10KHz120W RMS 8ohm)
- Frequency Response:5Hz-140KHz(-3db 120W RMS)
- Gain:28.7db
- Load Impedance:4ohm-16ohm
- Input Sensitivity:1.27V(0db)
- Input Impedance:56Kohm
- S/N:=95db(Without weight)
- Input Interfaces:RCA 1group
- Power Voltage:Customized according to different mains in different countries and regions.
- Static Consumption:55W
- Dimensions:430mm(W)X80mm(H)X385mm(D)
- Packing size:500mm(W) X 160mm(H) X 470mm(D)
- Net Weight:11Kg
- Cross weight: 13Kg
Asking Price : RM 1900
Contact : Astley 014-665 9388
Location : Sungei Wang Plaza